Reduce ambiguity in code writing

[paulincai]

meteor-collection2/package/collection2/main.js

Line 219 in 6b89fa5

Mongo.Collection.prototype[methodName] = function (...args) {

At line 219 and 220 among the parameters "args" is used in both functions and the initialization on line 220 does not use "const" or "let".
It is hard to follow the scope of various variables.

[github-actions]

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